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Route · SEA → PSC · 2020–2025 BTS data

Seattle to Pasco/Kennewick/Richland

According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), SEA to PSC (Seattle to Pasco/Kennewick/Richland) ranks #761 of 4927 tracked domestic routes by total flights (most flights = #1).

Data updated 2026-06-13

85.9%
On-time
+6.9 pts
vs US avg
63 min
Delay when late
13,307
Flights
#761 of 4927
Corpus placement

Cancelled

0.6%

Best Month

Nov 2024 90%

Worst Month

Feb 2025 68%

Distance

172 mi

Carriers

5

Monthly Performance

Recent 24 months of route data.

Period Flights Delayed Cancelled Diverted Carriers
Dec 2025 159 26 1 1 AS,OO
Nov 2025 163 20 7 0 OO,AS
Oct 2025 213 33 2 0 AS,OO
Sep 2025 167 23 0 0 OO,AS
Aug 2025 180 23 2 0 OO,AS
Jul 2025 185 33 0 1 AS,OO
Jun 2025 191 45 0 0 AS,OO
May 2025 235 46 1 0 AS,OO
Apr 2025 147 26 0 0 OO,AS
Mar 2025 133 23 0 0 AS,OO
Feb 2025 122 39 0 0 AS,OO
Jan 2025 152 30 0 0 AS,OO
Dec 2024 190 33 1 0 AS,OO
Nov 2024 155 15 1 1 OO,AS
Oct 2024 143 18 0 0 AS,OO
Sep 2024 116 22 0 0 OO,AS
Aug 2024 157 45 0 0 AS,OO
Jul 2024 177 41 0 0 AS,OO
Jun 2024 166 45 1 0 AS,OO
May 2024 169 36 0 0 AS,OO
Apr 2024 144 26 0 0 AS,OO
Mar 2024 119 20 0 0 AS,OO
Feb 2024 110 16 0 0 AS,OO
Jan 2024 125 33 7 1 AS,OO

SEA–PSC seasonal on-time pattern

Best: October (90.3%) · weakest: December (77.5%)

75%80%85%90%95% JanFebMarAprMayJunJulAugSepOctNovDec 77.5%

Strongest calendar month

October

90.3% on-time · ~197 flights/mo

Busiest calendar month

July

~209 flights/mo avg

Weakest calendar month

December

77.5% on-time · ~172 flights/mo

Cancellation Rate

0.6%

23 of 3,818 flights

Diversion Rate

0.1%

4 of 3,818 flights

Explore origin & destination

On-time and delay data for the airports this route connects.

SEA - Seattle

Full on-time, delay-cause, and seasonal performance for Seattle, WA.

SEA on-time profile

PSC - Pasco/Kennewick/Richland

Full on-time, delay-cause, and seasonal performance for Pasco/Kennewick/Richland, WA.

PSC on-time profile

Compare the two airports

See SEA and PSC side by side on delays, cancellations, and reliability.

Compare SEA vs PSC

Origin-hub reliability standing

Among SEA's stronger departures

SEA → PSC posts a 85.9% on-time rate, landing in the ≥85% band with 25 of 89 BTS-tracked routes leaving Seattle. The same hub also shows 63 mid-band and 1 challenged departures · fleet-wide on-time rank #943 of 4927 (highest on-time = #1).

What the Data Says About SEA to PSC

Seattle to Pasco/Kennewick/Richland (SEA to PSC) is one of the more dependable pairings in the BTS On-Time Performance dataset: a 85.9% on-time rate across 13,307 flights, with delays that do happen averaging 62.7 minutes. The corridor runs roughly 172 miles and is served by 5 carriers. Over the most recent 24 months, 23 of 3,818 flights were cancelled (0.6%) and 4 diverted (0.1%).

The monthly split is wide on this route: Nov 2024 posted the strongest performance at 90% on-time, while Feb 2025 came in at just 68% - a 22-point swing worth factoring into travel timing.

On the multi-year calendar, SEA–PSC peaks in October at 90.3% on-time while July carries the heaviest traffic (~209 flights per month) ; the softest month is December at 77.5%, a 12.8-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.

Frequently Asked Questions

Where does SEA to PSC rank among US routes by traffic? ▼
According to PlainFlights' route traffic ranking, SEA to PSC ranks #761 of 4927 tracked domestic routes by total flights (most flights = #1). That ordinal matches our busiest-routes listing (total_flights DESC). See /methodology#corpus-placement for the exact sort basis.
How often are flights delayed from SEA to PSC? ▼
Flights from Seattle to Pasco/Kennewick/Richland have a 85.9% on-time rate based on 13,307 flights. The average delay is 62.7 minutes. The best recent month was Nov 2024 with 90% on-time.
What is the cancellation rate for SEA to PSC? ▼
Over the last 24 months, 0.6% of flights on this route were cancelled (23 of 3,818 flights) and 0.1% were diverted.
How far is the flight from SEA to PSC? ▼
The flight distance from Seattle (SEA) to Pasco/Kennewick/Richland (PSC) is approximately 172 miles. This route is served by 5 carriers.
When is the best time to fly from SEA to PSC? ▼
The best recent month for on-time performance was Nov 2024 (90% on-time). The worst was Feb 2025 (68% on-time). Consider booking during months with historically better performance.

Airports on this route

SEA Airport

Seattle
PSC Airport

Pasco/Kennewick/Richland
Data source

Data Source: Bureau of Transportation Statistics (BTS), On-Time Performance Data. Statistics reflect cumulative performance across all available reporting periods.

Read our methodology - how this data is sourced, computed, and verified.

Using SEA–PSC data

SEA–PSC runs 6.9 pts above the national 79% average; the remaining risk is month-to-month swing and carrier mix, not a weak headline rate.

  • Compare SEA and PSC airport profiles: delay causes and top routes differ even on the same corridor. SEA airport
  • If your dates flex, October (90.3% on-time) beats December (77.5%) on this corridor. Seasonal chart
  • 4 other routes post a similar 85.9% on-time rate; compare before you commit to this pairing. Similar routes

On-time rate reflects the BTS historical average across all reporting carriers on this origin–destination pair, not any single flight or booking recommendation.

Data sourced from U.S. Department of Transportation Bureau of Transportation Statistics (BTS) On-Time Performance data. See our methodology for details. Retrieved and formatted by PlainFlights

Every figure on PlainFlights is rendered directly from BTS On-Time Performance data, no number is typed in by an editor. This page aggregates this specific route's on-time performance and monthly trend, live from the dataset. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.